US2327555A - Fastener - Google Patents

Description

45 1943- 5 F. G. PURINTON 2,327,555

I FASTENER Filed Aug. 29, 1942 2 sheets-sheet 1 firrasi $222502,

Aug. 24, 1943. PURlNTON 2,327,555

FASTENER Filed Aug. 29, 1942' 2 Sheets-Sheet 2 jlwuenkva WWW-w Patented Aug. 24, 1943 UNlTED STATES PATENT OFFICE 1 t 2,327,555 I t FASTENER Application August 29, 1942, SerialNo. 456,682

17 Claims.

My invention relates to newand useful improvements in fasteners, and more particularly to a fastener that isespecially adapted to hold two plates together, was as the cowling on airplanes and the like. v 1 There are at least'four major considerations or desiderata in a fastener of this kind, the first being a fastener that is strong and eflicient in service; second, wherein the fastener will have lasting powers- -that is, not wear out within a reasonable time although subjected to constant use; third, a fastener that may be quickly and readily installed andfourth, a fastener that can be manufactured economically and also in a relatively short time. i

Anobject of the invention, therefore, is to provide af'aste'ning means that will meet these four major prerequisites, and also have a number of other advantages which will be disclosed and explained as the specification proceeds.

With theseand other objects in view, the invention consists in certain new and novel ar ran'gements and combination of parts as will be hereinafter'more fully described and pointed out in the claims. 7

Referring now to the drawings showing two forms, the first'of which is somewhat lighter but not quite so strong as the second, i

' Fig. 1 is a top plan view showingthe fastener inits locked position; v H 1 Fig. 2 is'a similar view but showing the fastener inits unlocked position;

Fig. 3 is a sectional view taken on line 3-3 ofFig. 1; i

Fig. i is a sectional view taken on line 4-4 ofFi'g. 1;

" Fig. 5'is an enlarged fragmentary view of the spring or'socket member showing how the cam and locking surfaces appear; a

Fig) 6is a sectional viewof the stud on an enlarged scale;

' Figi l is a fragmentary diagrammatic view showing how the spring member cannot be forced beyond its elastic limit;

Fig. 8 is a detail of a hollow rivet before being formed to shape;

Fig. 9'shows a solid rivet which may be shaped to form the stud;

Fig. 10 is a top'plan View similar to Fig. 1 showing the heavier and stronger form of fastener andembiodying the major principles of the fastener shown in Fig. 1; A

Fig llshows the fastenerin its unlocked position; 1

' Fig. 12 is a. side elevation of the fastener;

Fig. 13 is a sectional view taken on line lS-iii of Fig. 11; l

Fig. 14 is an enlarged sectional view taken centrally of Fig. 10 but with the stud removed for the sake of clearness of illustration;

Fig, 15 is a view of the spring member as cut from the stock and before being bent to shape; and

Fig. 16 is a detail of the stud.

, Referring now to the drawings and for the movement to Figs. 1 to 9 and especially to Fig. 3, there may be seen the two platesA and B which are shown to illustrate the manner in which the fastener is used to hold two plates together; 1

'I'o'the one plate B is fastened the stud or key C. This stud C as shown in Fig. 8 may have the hollow shank l, the head 2 and the kerf 3, the. end of the shank then to be swedged to form the resultant ears 4, as may be seen in Fig. 6.

If desired, however, the stud may have. the solid shank 5 and, of course, it will have its end swedged to form ears similar to the hollow form of stud.

' To non-removably fasten the stud C to its plate B, I stamp out the plate B as at ,5, Fig. '6, the opening being somewhat larger than the diameter of the shank. Then the metal surrounding this hole is dimpled or swedged as at l in Fig. 6. The

stud in the form shown in Fig. 8 is then inserted in the plate and the hollow end is flattened to form the. ears 4, after which there is no possibility of the stud becoming. detached from the plate. j

It will be understood that if the hollow stud is used in the removable cowl plate the same may be passed through the opening in the plate, and then the hollow end flattened to form ears, this done in the field rather than in the shop, By placing a screw driver, or coin within the kerf 3 it is a simple matter to revolve the stud a quarter turn so that the fastener will be in a locked or unlocked position as will be shortly mentioned.

' Referring now to the spring or socket member D, it might be mentioned that it is made of a fiat spring steel having arms 8 bent downwardly and inwardly. These inbent arms 8 are then cut out and turned upwardly as at 9 tof-orm stops or feet so that if the spring member is subjected to a severe load which will stress it beyond its elastic limit if it is unrestrained, the spring will bottom on theupper ends of the feet 9 long before the elastic limit is reached and thus before the spring can be harmed by distortion;

Normally these stops do not contact with the under surface or" the spring member D, as may be seen in the several views. However, by extending the stops upwardly to provide a clearance of about one thirty-second (3 -2) of an inch, the spring may normally flex but an overloading beyond its elastic limit will be prevented.

As may be seen in Fig. 3, rivets H] can be used to hold the spring member D to its plate A, as a header can easily be placed in the space between the under surface of the plate D and the rivet heads.

Referring now to one of the principal features and advantages of the fastener, reference is made to Fig. 5 where will be seen formed in :the spring D the entrance notches II, this advancing cam" by using a die that will cut outa center opening,

swedge the peripheral metal wallsdownwardly about the opening and at an angle corresponding to the bevelled angleof the ears. Then, after the stud .is once passed through the elongated jopening P5 in the plate .A, whicnopening maybe seen in dottedvlinesin Figs. 1 and 2 and follows inoutline the socket opening .and is located directly beneath the same, aquarter-turning of the stud fromthe pcsitionshown in Fig. 2 '(antieclockwise) vIto the pos'itionshown in'Fig. 1 will flex the spring as-the ears ride over the advancing cam surfaces and tightly pull the plates together. A full quarter rotation of the stud will therefore cause the ears to snap Within their sockets I3 to thus hold the spring in a flexed position, and hold the-two plates A and'B tightly together.

'The stops M of course prevent more than a quarter turn of the .stud, as will ,be readily appreciated. v

After the-stud .with its opposite ears .is set in the sockets theears willnever jar or work there,- from and will necessitate an intentional retrograde turning of (the stud by a tool placed in the kerf thereof to unlockithe fastener. f

The walls about the opening l5 of the plate a i will be swedged to nest the swedgedwall T! "in .the plate B so that the two plates, of course, will ffit tightly together.

By forming 'the stud with its oppositely disposed ears and by forming .the advancing cam surfaces and sockets in the spring rrremberon the angular walls as mentioned, it w "be seen that there is a maximum of jconjta'ct of 'jmietailhetween the .twoiparts. There will be no ggaillin'g 'or-jappreciable wea "ngefiect gby the turning of the stud and by so, constructing "thestud and socket, both members should lastthroughout the'lifeof the platesto which they are attached.

Also, byflpfiovidin'g the stops adjacent :the sockets, there is nopossibility of turningthe "stud more than ithe desired guarter "turn; .which'is, pf course, necessary. .as..shoril dfthe stud .make, say, a half ,turln, theLfasten/er would be 'inan unlocked pesi o i ,It willalso ybe .seen that after providing the forming tools or {dies at is a relatively sirnplernatf her t a ra =P e fq zm ie- Wis es a surfaces, sockets and steps: within {the spring member, thus lIlQkllflfi fOIUfl fastene-r that can be stamped out quickly and in large quantities,

Referring now to the form shown in Figs. 10

to 16, the same form of entrance notches, ad-

ably stamp out of one inch coil strip steel the' spring socket member E. In this spring there will be cut the elongated slots Hi, the holes l'l for the rivets, the central opening I 8 and the open ended slots 1P9, :these latter slots forming the stops'm when the spring is bent to shapaas "will lee shortlyjmentioned.

The center opening (socket) will have the downwardly extending peripheral walls I8 as in the other form and, of course, will be provided with the entrance notches 21,, advancing-cam surfaces 22, sockets .23 and stops 24,,lexactlylas the formshow-n in File. 5,

Additionally, there. willbe stamped ,upon .the

spring member about the socket toner-ling) 18 the ring .3], the inner walls ,of whichmerge with the walls J81 (as mentioned, ,on which walls entering arms 32 while thelportions ill-will he bent upwardly to form.,stops .so that the-=hody portion of the spring may ,bottom on these ,four stops if too great a pull is placed ,on the-same. Rivets 33 are shown asseuring vthespring member E to its plate F-and there will ofeourse, bee

circular opening .34 (formed in the g-plateaF in r istry with .the socket- -l-8.v

The diameter of the .opening3dwi1l begreat enough to let the ears ,of the solid -.ty,pe of stud shortly to be mentioned pass therethzgough regardless of their.rotatiye position, and .up {into the entrance notches formed in the .spring mem- V ber E.

The metal as at 3t in the bottom (of .the sprin arms may-'be slightl :oflfset as may be clearly seen in Fig. 14. 1 r I -1 By forming the four stops 'or feet and spacin them about the center opening -I 8 ,any zexcess flexing :of the spring will be pre icated to thus; avoid loading the spring beyond litselastic limit;

.Also (the formation of vthiS raised integral ring 3| has served several useful purposes. Firstyit prevents the distortion of themetal ,at' the sides of the spring stock when drawing down the walls about the center opening ,and in-lfonmingrthe sockets, stops and cam lsuriaces .Thesring/ls preferably e5; in diameter anditdsrtolbe remembered that the stock metal itself .is only one limb in width.

When'the forming oomesso -near-the two sides of "stock strip there is practically no :room to hold the metal with flat toolsdurins tnerdrawius operation, but :by .providingthe stamped ring, mating grooved tools may be used to rbetter hold the stock and thus prevent the-sides ,lfrom mulling in as the center is drawn down.

Again, this stamped ring :also serves "to strengthen the center portion {and {helps to confine the resiliency to the ,bent endseor :arms.

Thus, by using a spring ,formed .of .coil .steel one inch .in width :and .forming the arms ,and

ring as shown, I can obtain an initial holding power of -fiftypounds, which .is. also .a desiredlre quirementin a fastener of thiskin'd.

It will be understood that although it is pref.- erable to have a stamped up ring 3| as shown, the raised portions might be in the form of segments or parallel lines or other configurations about thesocketv to thus strengthen the walls about the same.

The stud 26 is preferably made from asolid rivet with the two oppositely disposed ears 21. There is a flange 28 on its shank, and the usual head 29, so that as the stud is passed through anlopening 30 (Fig. '13). in its plate G. the. surrounding walls 30a..will be swedged or rimmed under the flange 28 so thatthe stud after once being fixed in its plate cannot be lost therefrom.

Likewise the plate F to which the spring member is'riveted will have its walls 34a about the opening 34 swedgedjtonest on the aforementioned walls 30a.

From the foregoing it will be seen that I have devised a fastened which is not only strong and serviceable when first'installed, but under ordinary conditions will give far longer service than other forms of fasteners now in use, due to the fact that there is a maximum amount of surface presented between the angular resilient walls of the socket and'its I contacting stud.

Thus, even after continued use, itwill not be necessary to install new studs or cut out the rivets and install new socket members.

Also, where-the lighter metal is used for the spring member this spring may have but two stops or feet on which the spring may bottom when put under tension, and the raised ring on the-face ofthe spring may be dispensed with.

However, when the springmember with four feet or stops isused, the stops straddling-the conical part of the socketwhich is formed in the plate to receive the head of the stud will cause the spring member in' case of an overload-to bottom as near the center as is possible. Also; the ring member adds rigidity and serves to stiffen thecen'ter portion and confine resiliency to the bent' arms.

Again, by stamping in the ring or like raised portion .the' stock can be better held in forming 1 so that the sides will be prevented from being drawn down as the center socket is pressed to shape. Finally. it willbe seen that by using openings in boththe fixed an'dthe movable cowl plates, f

greater than the distance across, the swedged ears of the stud. these ears mayjbe ,swedged in the manufacturing instead of in the field whe'nassembling,

It is also to be understood that although I have shown in both types of fastener the ends of the arms being bent upwardly to form stopsv to prevent an overloading of the spring, it is obvious that other forms of stops might be employcd. such as lengthening the depthof' the socket so that it might bottom on the plate to which it isfastened and thus prevent an overloading of the spring.

Many slight changes might be made without departing from the spirit-and sco'peof the invention.

Having thus described my invention. what I claim as new and desire to secure by Letters Patentis: j

1. In a two-part fastener a spring member hav ing a central opening, the walls defining the opening be ng unbroken and extending downwardly and inwardly, said walls having formed therein. oppositely disposed notches, advancing cam surfaces, sockets, and stops, 2. cooperating stud, the opening adapted to receive the cooperating stud so that a partial-rotation of the stud will flex the spring member as it rides over the advancing cam surfaces, the sockets holding the stud against a retrograde movement and the stops limiting the advancing rotative movement of said stud.

2. In a two-part fastener, a flat spring member having a central opening therein, the walls defining the opening being unbroken and extending downwardlyand inwardly, saidwall having formed therein a notch, an advancing cam surface, a socket and a stop, a cooperating stud, the openin adapted to receive the cooperating stud so that a partial rotation of the stud will flex the spring member as .it rides over the advancing cam surface, the socket holding the stud against a retrograde movement and the stop limiting the advancing rctativemovement of said stud, i i

3. In a two-part fastener, a flat spring member having downwardly and inwardly extending integral arms to support the same, the said mem ber having a centrally disposed opening, the walls defining the opening being continuous and extending downwardly, said walls having formed therein a contiguous notch, advancing cam surface, socket and stop extending substantially to one side of a line drawn centrally and longitudinally of the fastener, and a like notch, ad,- vancing cam surface, socket and stop on the opposite side of said line. the last-mentioned notch, advancing cam surface, socket and stop being respectively oppositely disposed with rela tion to those first mentioned, a cooperating stud having oppositely disposed ears, the said opening adapted to receive the cooperating stud and its oppositely disposed ears, so that after the stud is inserted, a partial rotation of the same will flex the spring member as the earsv ride over the advancing cam surfaces, the sockets holding the stud against a retrograde movement and the stops limiting the advancing rotative movement of said. stud.

4. In a two-part fastener, a flat spring member, including downwardly and inwardly extending arms at its opposite ends, the said memher also having a central opening therein, the walls defining the opening being continuous and extending downwardly and inwardly, said walls having formed therein oppositely disposed notches, advancing .cam surfaces, sockets and stops, astud having a head at one end and out: wardly extending ears on its other end, the said ears of the stud adapted to pass through the notches in said spring member and ride over the advancing cam surfaces on a partial rotation to thereby place the spring under tension, the socketsholding the stud against a retrograde movement and the stops limiting the advancing rotative movement of said stud.

5. A two-part fastener including in part a relatively flat spring member having arms extending downwardly, inwardly and then upwardly and terminating short of the under surface of the body of the spring member, the body of the spring member having a central opening formedtherein, the walls defining the opening being continuous and extending downwardly and inwardly, said walls having formed therein oppositely disposed notches, advancing cam surfaces, sockets and stops, the said opening adapt .ed to receive a cooperating stud and the upwardly extending armslirniting the downward movement of the bodyof the spring member.

*6. A fastener including in part a relatively fiat spring member having arms extending downwardly and inwardly, an open socket in" said spring member, the walls defining the opening of the socket being continuous and having formed-therein oppositely disposed notches, advancing cam surfaces, seats and stops, the said socket adapted to receive a cooperating stud and means for limiting the downward flexing movement of the body of the spring member.

'7; A fastener including in part a relatively i'iat spring member having its ends extending downwardly, inwardly and then upwardly and terminating short of the under surface of the body of the spring member, the body of the spring member having an open integral socket tor-med therein and the walls of the socket extending below the surface of the body defining the spring member, the walls of the socket having formed therein oppositely disposed notches, advancing cam surfaces, locking sockets and adjacent stops, the said locking sockets adapted to, receive and hold a cooperating stud and the upwardly extending ends of the arms limiting the downward movement of the body of the spring member.

8. A fastener including in part a relatively flat spring member having its ends extending downwardly, inwardly and then upwardly, and terminating short of the under surface of the body of the spring -member, the body of the spring member having an integral open socket therein midway between the upwardly extending portions of said arms, thesa-id socket extending below the surface of the body of the spring member. the walls defining the open socket being unbroken and having formed. therein oppositely disposed notches, advancing cam surfaces,'relatively small locking sockets and adjacent stops, and the spring member adapted to receive and hold a cooperating stud and the upwardly extending ends'of the arms'limitingthe downward movement of the body of the spring member.

9. A fastener including in part a relatively flat spring member having a body portion, arms at the ends of the body portion and said arms extending downwardly, inwardly and then upwardly and terminating short of the under surface of the body of the spring membenthe body of the spring member having anopen bottom socket disposed midway between the upstanding ends of the arms, the walls defining the opening att'he bottom of the socket having oppositely disposed advancing cam surfaces, seats and stops adjacent the seats, the said socket adapted to receive and hold a cooperating stud and the upwardly extending ends of the arms limiting the downward movement of the body of the spring member.

10. A fastener including in part a relatively flat spring member, the ends of the spring member extending downwardly, inward-1y and then upwardly and terminating a slight distance below the under surface of the said spring member, to thereby limit the downward flexing of the same, a. depressed socket having a continuous wall formed in the spring member midway between said arms, cam surfaces and seats on the walls of said sockets adapted tocooperate with a rotatable stud to thereby place and hold said spring member under tension. 1

11. A fastener including in part a spring member formed of :a fiat meta-l strip, 'a socket located centrally of the spring member, the metal about flat spring member comprising a body portion,

the socket 'sbeing reinforced, th e socket being open at its 'bottom' and :the walls defining-the openingsbeing continuous and having entrance notches, advancing cam surfiaceaiseats and stopsv thereon adapted to receive a cooperating "locking" stud and means on the spring member (for limiting the downward movement :of the socketto thus prevent loading .the' spring member beyond its-elastic limit. I 12. A fastenerwincluding in part a relatively arms at the ends 'ofthe body portion, the'said arms being'extended downwardly andin-Wa'rdly,

the body of the spring member provided witha socket and the body of the spring member'- '-having pressed-up portions thereon and disposed in close proximity 'to the socket for' strengthening the metal about the socket, the-said socket'hav 'ing advancing cam 'surfaces, seats and stops formed thereon, adapted to cooperate with a ro tatable stud to thereby placeand hold the spring member-under tension and means'for limiting the downward flexing movement'of the bodyfportion of the spring member. i

13. A fastener including in part a relatively flat I spring member comprising a body portion, downwardly and inwardly extending arms, and the ends of said. arms extending upwardly and terminating slightly beneath the under surfaceof the body of the spring member, a pressed-up'rlng in the body of the spring member located'abov the aforementioned upwardly'extending endsoi the arms, the metal confined with the ring member extending downwardly and perforated at its bottom, the downwardly extending metalbeing unbroken and forming a socket'ha'ving advancing cam surfaces, seats and stops formed therein) adapted to cooperate with a rotatable stud to thereby place and hold the spring member under tension. l I

14. A fastener including in part a relatively flat spring member comprising a body portion, two arms at each end of the bodyportionsfthe said arms extending downwardly, inwardly and then upwardly to form f oursto'ps, the body of the spring member having an upstanding "ring thereon and located centrally over the four stops, the metal confined within the ring'memberextending downwardly and inwardly and perforated at its bottom, the downwardly extending metal within the ring member forming a socket with continuous walls, the said socket having advance member comprising a body portion, two arms at' each end of the body portion, the saidarms being extended downwardly, inwardly and then upwardly to form four stops, the body of the spring member having a pressed-up ring thereon and located centrally over the four stops/the metal within the spring member being pressed downwardly and inwardly and perforated; at its bottom, the downwardly extending metalwithin the ring'member forming a socket with continu ous walls-defining the opening in the bottom,-entrance notches, advancing cam surfaces, seats and stops formed on said defining walls and the said spring member being fastened. to a plate two plates having an opening registering with said socket, a

rotatable stud having outwardly extending ears thereon and said stud permanently fastened to a separate plate, and a quarter turn of said stud after being placed in said entrance notches adapted to flex said spring member and hold the same under tension to thereby hold the two plates together. a

16. A two-part fastener including in part a spring member formed of a flat metal striphaving an up-pressed ring located centrally of the length and width of the said member, the said spring member having cutout portions on the opposite sides of said ring and the opposite ends of said spring member being centrally notched, the said spring member being adapted to be bent downwardly and inwardly midway between the length of the cutout portions to form resultant arms and the notched end portions of the member being adapted to be bent upwardly to form bottoming stops, the metal confined within the ring being continuous and extending downwardly, perforated at its bottom and having entrance notches,

I advancing cam surfaces, seats and stops formed seats and stops formed thereon and adapted to cooperate with a rotatable stud to thereby place and hold the member under tension.

FORREST G. PURINTON.

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